CN116720285B - Parameterized design method for complex shell structure - Google Patents
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Abstract
The invention discloses a parameterized design method of a complex shell structure, which provides an overall parameterized definition design method for accurately reflecting the actual structural appearance of the complex shell structure component according to the geometric appearance characteristics and the constitution of each component of the complex shell structure and comprehensively considering the requirements of a product digitalized development system taking a digitalized model machine and feature modeling as technical characteristics. The method is characterized in that corresponding overall parameterization definition is formulated for various components of the complex shell structure according to the structural geometric characteristics of the components, so that overall parameterization description of the geometric shapes of various components of the complex shell structure is realized, information such as materials, processing technology and the like is introduced on the basis of the parameterization definition of the geometric shapes, and a set of general expression mechanism for the whole component data structure of the complex shell structure is provided, so that the data required by geometric modeling and structural analysis of the complex shell structure can be conveniently provided, and related data information can be provided for processing and manufacturing of the complex shell structure.
Description
Technical Field
The invention relates to a structural design technology, in particular to a parameterized design method of a complex shell structure section.
Background
The shell structure has the characteristics of light weight and high strength, and directly influences the performances of structural strength, dynamic characteristics and the like of the complex structure. Therefore, the research of developing the design of the complex shell structure has very important meaning and value for the development and improvement of the general shell structure. Complex housing structure designs typically include multiple flows and simultaneously cover multiple disciplines of geometric modeling, structural mechanics, dynamics, noise, vibration, etc., each discipline also including multiple branches, especially for applications in complex housing structures, making the design process more complex and cumbersome. Therefore, the complex shell structure design process is a complex engineering problem with high technical concentration and wide subject. However, for a long time, the design method of the traditional shell structure gradually exposes the problems of low design efficiency, poor precision, lag of applied technical methods and means, neglecting coupling effect among various subjects in the engineering system, and the like. In addition, at present, the digital development system is urgently required to be opened in China, and higher requirements are put forward on the design process of the complex shell structure. Therefore, the development of digital design research on complex shell structures has important significance.
Disclosure of Invention
The purpose of the invention is that: research on complex shell structure design is carried out.
In order to achieve the above purpose, the technical scheme of the invention is to provide a parameterized design method of a complex shell structure, which is characterized by comprising the following steps:
step 1, building a material characteristic database by analyzing the structural design of a complex shell, wherein each material in the material characteristic database is provided with a unique number, and an external program calls the material characteristic of the corresponding material through the number;
step 2, analyzing and summarizing the component structures of the complex shell structure, and establishing an overall parameterized data structure formed in a defined manner for each component structure according to the structural characteristics of each component of the complex shell structure, wherein the overall parameterized data structure at least comprises material parameters formed by corresponding structural material parameter data and structural parameters formed by each section or layer data pointer, and the overall parameterized data structure comprises the following components: the material parameter data links the material characteristic database to call the corresponding material characteristic, and the material parameter data structure comprises a material name and a material type; section or layer data pointers point to each section or layer specific parameter data of the next stage;
step 3, packaging the whole parameterized data corresponding to each component structure into an object form, and forming a tree structure according to the pointing relation pointed by the section or layer data pointer; finally, all the component structures form a complex shell structure design system centered on the cross-sectional description.
Preferably, the structural parameters in the overall parameterized data structure are structural parameterizations of various component structures of the complex shell structure through overall outline definition, layered definition or multi-section definition according to structural geometric characteristics and constituent principles of various components of the complex shell structure.
Preferably, the complex shell structure comprises a bearing assembly structure, the parameterization definition of geometric information of the overall outline definition of the bearing assembly structure is realized through segmented description, the description of each segment is represented by geometric parameters of a starting point section and an ending point section of each segment, and the geometric parameters of the sections between each segment are obtained through linear or curve interpolation of the geometric parameters of the starting point section and the ending point section.
Preferably, the overall parameterized data structure of the force bearing component structure comprises an overall data table and a profile data table, wherein the overall data table comprises material properties, process properties and structural geometry data, wherein the structural geometry data store profile data pointers of the force bearing component structure, and the profile data pointers point to the profile data structures of the corresponding force bearing component structure, and the profile data structures comprise profile positions x, middle points m, thicknesses h and geometric shape parameters { y } 1 ,h 1 },{y 2 ,h 2 },…, {y m ,h m }, itIn h=max (h 1 ,h 2 ,…,h m )，y m Represents the y-direction coordinate of the mth point, h m And h-direction coordinates of the mth point are represented, wherein the x-direction and the y-direction form a right-hand coordinate system with the thickness h direction, and the x-direction points to the normal direction of the plane surface where the section is located.
Preferably, the complex housing structure includes a supporting component structure, and a plurality of supporting component structural components are connected together to form a multi-closed-chamber structure in the cross section of the complex housing structure, the cross section profile of the supporting component structure has multiple types according to actual functions, the geometric description of the overall profile definition of the supporting component structure is realized by a multi-profile definition mode, and the parametric definition of the overall profile definition is realized by giving geometric parameters of a starting point cross section and an ending point cross section and an intermediate cross section of the overall profile definition.
Preferably, the overall parameterized data structure of the support component structure comprises a layer of overall support component data table, a layer of single support component structure data table and a layer of section data table of the support component, wherein the overall support component data table is used for storing data pointers pointing to each support component structure forming the complex shell structure; a single support element structure data table is used to store material properties, process properties, and structural geometry data for each support element structure, the structural geometry data storing profile data pointers to the support element structure profile data structures corresponding thereto, the profile data structures including profile position x, median point m, thickness h, and geometry parameters { y } 1 ,h 1 },{y 2 ,h 2 },…, {y m ,h m }。
Preferably, the complex shell structure comprises a surface shell structure, and the parameterization definition of the surface shell structure is realized by layering definition of the surface shell structure.
Preferably, the overall parameterized data structure of the surface shell structure comprises an overall data table of the surface shell structure and a layer of paving data, wherein the overall data table is used for storing pointers pointing to different paving data; the layup data includes the material properties of each layupSex and structural geometry attributes including material model, fixed point number, thickness, ply angle, ply coordinates, structural geometry attributes { y } 1 ,h 1 ,θ 1 },{y 2 ,h 2 ,θ 2 },…,{y m ,h m ,θ m }，θ m Indicating the relative rotation angle of the mth ply.
Preferably, after all the component structures in the complex shell structure are determined, the residual space in the complex shell structure is filled with the filler, and the filler does not need to be defined in structural dimension; the support assembly structure divides the space within the complex housing structure into a plurality of blocks, the number of fillers is 1 more than the number of the support assembly structure, and each block of fillers defines the material name and type according to different materials.
Preferably, the overall parameterization data structure of the filler comprises a layer of overall filler data table and a layer of filler data table, wherein the overall filler data table stores data pointers pointing to the filler data of each block at the section position of the complex shell structure according to the filler of each block, and the filler data table is used for storing names, types and annotation contents of filler materials.
According to the geometric shape characteristics and the constitution of each component of the complex shell structure, the invention comprehensively considers the requirements of a product digital development system taking a digital prototype and feature modeling as technical features, and provides a whole parameterization definition design method for accurately reflecting the real structure shape of the component of the complex shell structure.
Compared with the prior art, the invention has the beneficial effects that: the invention relates to a parameterized design method of a complex shell structure, which is characterized in that corresponding overall parameterized definition is formulated for various components of the complex shell structure according to the structural geometric characteristics of the components, so that not only is the overall parameterized description of the geometric shapes of various components of the complex shell structure realized, but also information such as materials, processing technology and the like is introduced on the basis of the parameterized definition of the geometric shapes, and a general expression mechanism for the whole component data structure of the complex shell structure is provided, so that the data required by geometric modeling and structural analysis of the complex shell structure can be conveniently provided, related data information can be provided for the processing and manufacturing of the complex shell structure, and an intelligent guide complex shell structure component definition module is developed to guide a user to realize the definition of the components in a simple and visual interaction mode. Thereby greatly improving the accuracy and the high efficiency of the structural design of the complex shell structure.
Drawings
FIG. 1 is a schematic diagram of a complex housing structure with a cross-section of the invention as a core;
FIG. 2 is a schematic diagram of a parameterized data structure of an overall complex housing structure of the present invention;
FIG. 3 is a schematic cross-sectional view of the structure A of the present invention;
fig. 4A and fig. 4B are schematic views of a cross-sectional data structure of the structure a according to the present invention;
FIG. 5 is a schematic cross-sectional view of a structure B according to the present invention;
FIGS. 6A and 6B are schematic diagrams illustrating a cross-sectional data structure of a structure B according to the present invention;
FIG. 7 is a schematic view of a cross-sectional structure of the structure C of the present invention;
FIG. 8 is a schematic diagram of a data structure of a section C of the structure of the present invention;
FIG. 9 is a schematic cross-sectional view of a packing of the present invention;
FIG. 10 is a schematic diagram of a cross-sectional data structure of a filler according to the present invention.
Detailed Description
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents are intended to fall within the scope of the claims appended hereto.
The embodiment discloses a parameterized design method of a complex shell structure, which comprises the steps of firstly analyzing and summarizing the component structures of the complex shell structure to establish a material characteristic database; and then analyzing and summarizing the component structures of the complex shell structure, respectively providing a corresponding overall parameterization definition method aiming at the structural characteristics of each component of the complex shell structure, establishing a corresponding data structure for describing the contents such as the composition, the component materials, the section dimension parameters and the like of each section component, and forming a complex shell structure design system centering on section description, as shown in fig. 1. In the process, all data are packaged into the form of objects and form a tree structure, and each object has a method and attribute for operating the collection by itself, such as an Add (Add), a Remove (Remove), an acquire sub Item (Item) method and a Count (Count) attribute, so that all other objects can be accessed layer by layer through the root object. The automation object server is accessed mainly through a programming language to perform operations such as connection and embedding of objects.
1. Parameterized database of complex shell structures
The complex housing structure is a whole formed by multiple components, so that the definition of the whole structure of the complex housing structure is realized, and the definition of various components forming the complex housing structure is needed. For definition of various components, considering that geometric parameters of a structure need to be given in the process of modeling, material processing and manufacturing of various structural components of a complex shell structure, performance parameters of the given material need to be given in the process of analyzing and calculating certain structures, for example, density of the material needs to be introduced when calculating the weight of the complex shell structure, static elasticity (such as tensile modulus, shearing modulus and the like) and static mechanical properties (such as compressive stress limit, tensile stress limit and the like) of the materials of various components need to be used in static strength analysis, so that the parameterized data structure of the complex shell mainly comprises two parts: one part is the geometric shape parameter of the complex housing structure assembly; another part is the material properties of the complex housing structure assembly. The parameterized complex shell data structure established by the invention is shown in fig. 2.
Based on the specific current situation of complex shell structure analysis design, the invention establishes a material characteristic database, defines a material model data card and stores the material model data card for the related function module to be called in the subsequent analysis process. The callable material parameters differ according to the type of analysis target: for example, for static load analysis, elastic modulus, tensile strength, yield strength, etc. can be extracted; for fatigue load analysis, the fatigue strength of the material library, etc. may be extracted. To facilitate program identification and invocation, a unique number is defined for each material.
The material characteristic database has extensibility, and a user can add or delete material names, types, attributes and the like according to requirements. In addition, the user can also directly call the existing data in the material characteristic database based on the material characteristic database, and customize the material owned by the user on the basis and store the material in the material characteristic database as new material.
2. Structure parametrization of various components
According to the structural geometric characteristics and the construction principle of each component of the complex shell structure, the structural parametrization of each component of the complex shell structure is realized through various modes such as integral appearance definition, layering definition, multi-section definition and the like. Various components of the complex shell structure are analyzed and discussed below, and structural parametrization of the various components is realized.
2.1 Structure A
Structure a is the main load bearing component of the complex shell structure, and the parameterization definition of the geometric information of structure a is realized by segment description. The description of each segment is represented by the geometric parameters of the starting point profile and the ending point profile of each segment, and the geometric parameters of the profile between each segment are obtained by linear or curve interpolation of the geometric parameters of the starting point profile and the ending point profile.
As shown in fig. 3, the structure a cross-sectional structure is realized by a parameterized definition of geometry. Contour line (0-P) of structure A section fitted by contour node m ) The composition is formed. The data structure of the structure a in the present invention is shown in fig. 4A and 4B. It is divided into two layers: one layer is the structure a whole data table and the other layer is the profile data table. The overall data table contains mainly material properties and structural geometry data. The structure geometry data stores structure a profile data pointers that point to their corresponding structure a profile data structures.
2.2 Structure B
The structure B mainly plays roles of supporting and partial bearing, and the complex shell structure is a plurality of structures B. The connection between the structure B and the structure C and the connection between the front structure B and the structure C and the rear structure B and the structure C enable the section of the complex shell structure to form a multi-closed-chamber structure, so that the structural strength and the rigidity of the complex shell structure are improved. Structure B is shown in fig. 5. The geometric description of structure B can also be realized by means of a multi-profile definition. The parameterized definition of structure B is achieved by giving the geometric parameters of the starting and ending sections of structure B and the intermediate section. It should be noted that the geometric end points of structure B are attached to structure a, so that it is necessary to arrange contour nodes of structure a at the geometric end points of structure B.
The data structure of structure B is shown in fig. 6A and 6B. Since there are multiple structures B at the same time, it has one more layer of overall structure than the data structure of structure a. The first layer is a data table of an overall structure B, and stores data pointers of each structure B forming a complex shell structure; the second layer is a single structure B data table, which stores the material properties, process properties and structure geometry data of each structure B. A section data pointer of the structure B geometric data storage structure B; the third layer is a profile data table of the structure B, which stores profile parameters of the structure B, and similar to the structure A, the data of the third layer pointer is the geometric profile interpolation point of the single structure B.
2.3 Structure C
Structure C may be formed by laying up one or more plies in a general configuration, as shown in fig. 7, secured to both ends of structure a and structure B. The definition of structure C according to the present invention is achieved by defining the layering of the layers that make up structure C. The complete lay-up structure of the complex shell structure is determined by setting the type of lay-up, the geometric parameters of the lay-up and the material properties. Isotropic materials generally only consider the properties of the material itself, and anisotropic materials also need to consider ply thickness, ply angle, etc. The data structure of structure C is composed of two layers as shown in fig. 8. The first layer is the overall data of structure C, with pointers corresponding to structures C of different layers. The second layer is ply data, which contains the material properties and structural geometry properties of each ply.
2.4 filler
After the above component sizing, the remaining space within the complex housing structure is the filler, and therefore no structural sizing definition is required for the filler. Because structure B divides the space within the complex housing structure into multiple pieces, the number of fillers is 1 more than that of structure B. Furthermore, each block of filler may be composed of different materials, and thus, definition of material names and types is required for each block of filler. The data structure of the filler is shown in fig. 9. It consists of two tables, one is an integral filler data table and the other is a filler data table. The former stores data pointers for each filler in a complex housing structure section by the filler. The latter stores mainly the name, type and annotation content of the filler material.
Claims (9)
1. The parameterized design method of the complex shell structure is characterized by comprising the following steps of:
step 1, building a material characteristic database by analyzing the structural design of a complex shell, wherein each material in the material characteristic database is provided with a unique number, and an external program calls the material characteristic of the corresponding material through the number;
step 2, analyzing and summarizing the component structures of the complex shell structure, and establishing an overall parameterized data structure formed in a defined manner for each component structure according to the structural characteristics of each component of the complex shell structure, wherein the overall parameterized data structure at least comprises material parameters formed by corresponding structural material parameter data and structural parameters formed by each section or layer data pointer, and the overall parameterized data structure comprises the following components: the material parameter data links the material characteristic database to call the corresponding material characteristic, and the material parameter data structure comprises a material name and a material type; section or layer data pointers point to each section or layer specific parameter data of the next stage; the structural parameters in the integral parameterized data structure are structural parameterization of various component structures of the complex shell structure through integral appearance definition, layered definition or multi-section definition modes according to structural geometric characteristics and construction principles of various components of the complex shell structure;
step 3, packaging the whole parameterized data corresponding to each component structure into an object form, and forming a tree structure according to the pointing relation pointed by the section or layer data pointer; finally, all the component structures form a complex shell structure design system centered on the cross-sectional description.
2. The method according to claim 1, wherein the complex housing structure includes a bearing component structure, the parameterized definition of geometric information of the overall shape definition of the bearing component structure is implemented by segment description, the description of each segment is represented by geometric parameters of a starting point section and an ending point section of each segment, and the geometric parameters of the sections between each segment are obtained by linear or curve interpolation of the geometric parameters of the starting point section and the ending point section.
3. The method of claim 2, wherein the overall parameterized data structure of the load bearing assembly structure comprises an overall data table and an overall profile data table, the overall data table comprising material properties, process properties and structural geometry data, wherein the structural geometry data stores profile data pointers to the corresponding load bearing assembly structure profile data structure comprising profile position x, median point m, thickness h and geometric profile parameter { y }, the profile data structure comprises a plurality of profile data pointers to the corresponding load bearing assembly structure profile data structure 1 ,h 1 },{y 2 ,h 2 },…, {y m ,h m And, where h=max (h 1 ,h 2 ,…,h m )，y m Represents the y-direction coordinate of the mth point, h m And h-direction coordinates of the mth point are represented, wherein the x-direction and the y-direction form a right-hand coordinate system with the thickness h direction, and the x-direction points to the normal direction of the plane surface where the section is located.
4. The parameterized design method of a complex housing structure according to claim 1, wherein the complex housing structure comprises a supporting component structure, a plurality of supporting component structure components are connected together to form a multi-closed-chamber structure in the cross section of the complex housing structure, the cross section profile of the supporting component structure has multiple types according to actual functions, the geometric description of the overall profile definition of the supporting component structure is realized by a multi-profile definition mode, and parameterized definition of the overall profile definition is realized by giving geometric parameters of a starting point profile and an ending point profile and a middle profile of the overall profile definition.
5. The method of parameterizing a complex housing structure of claim 4, wherein the overall parameterized data structure of the support component structure comprises a layer of overall support component data table, a layer of individual support component structure data table, and a layer of profile data table of support components, wherein the overall support component data table is used for storing data pointers to the individual support component structures that make up the complex housing structure; a single support element structure data table is used to store material properties, process properties, and structural geometry data for each support element structure, the structural geometry data storing profile data pointers to the support element structure profile data structures corresponding thereto, the profile data structures including profile position x, median point m, thickness h, and geometry parameters { y } 1 ,h 1 },{y 2 ,h 2 },…, {y m ,h m }，y m Represents the y-direction coordinate of the mth point, h m And h-direction coordinates of the mth point are represented, wherein the x-direction and the y-direction form a right-hand coordinate system with the thickness h direction, and the x-direction points to the normal direction of the plane surface where the section is located.
6. The method of claim 1, wherein the complex housing structure comprises a surface housing structure, and the parameterized definition of the surface housing structure is implemented by hierarchically defining the surface housing structure.
7. The method of claim 6, wherein the overall parameterized data structure of the surface shell structure comprises an overall data table of the surface shell structure and a layer of pavement data, wherein the overall data table is used for storing the data of the layers pointing to different pavement numbersA pointer to the data; the ply data includes material properties and structural geometry properties of each ply, the material properties including material model, fixed point number, thickness, ply angle, and ply coordinates, the structural geometry properties being { y } 1 ,h 1 ,θ 1 },{y 2 ,h 2 ,θ 2 },…,{y m ,h m ,θ m }，θ m Represents the relative rotation angle of the mth ply, y m Represents the y-direction coordinate of the mth point, h m And h-direction coordinates of the mth point are represented, wherein the x-direction and the y-direction form a right-hand coordinate system with the thickness h direction, and the x-direction points to the normal direction of the plane surface where the section is located.
8. The parameterized design method of a complex housing structure according to claim 1, wherein after all the component structures in the complex housing structure are determined, the remaining space in the complex housing structure is filled with a filler, and the filler does not need to be defined in structural dimension; the support assembly structure divides the space within the complex housing structure into a plurality of blocks, the number of fillers is 1 more than the number of the support assembly structure, and each block of fillers defines the material name and type according to different materials.
9. The parameterized design method of a complex housing structure according to claim 8, wherein the overall parameterized data structure of the filler comprises a layer of overall filler data table and a layer of filler data table, wherein the overall filler data table stores data pointers pointing to the filler data of each block at the section position of the complex housing structure according to each block of filler, and the filler data table is used for storing names, types and annotation contents of filler materials.
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